American Company Signs Contract to Build Rooftop Wind Turbines for 90000 Sq-Ft Depot. Building Turbines, Corp. (OTC PINK: BL D_W) Focuses on the Study and Fabrication of Copyrighted Rooftop Wind Turbines. Target: 0.75 Stock: BL D_W Date: August, 5th Closed yesterday: $.038 Company Name: BUILDING TURBINES Green Energy Company Expected To Rise Monday!